Abstract

In this study, the food selection of abalone, Haliotis discus hannai, on four various diets, Ulva pertusa, Laminaria japonica, Navicula spp., and artificial diet, was investigated. The abalones in Ulva pertusa and Navicula spp groups had the higher migration rate than the others. The artificial group had the lowest migration rate. As to the growth, Ulva pertusa group had the highest daily increment and the growth rate, which is 120.7 <TEX>${\mu}$</TEX>m and 2.41%. The value of Navicula spp. group is 102.0 <TEX>${\mu}$</TEX>m and 2.04% and that of Laminaria japonica group is 88.7 <TEX>${\mu}$</TEX>m and 1.77%. The lowest one is 81.7 <TEX>${\mu}$</TEX>m and 1.63%, which appeared at the artificial diet group. We suggest that, when breeding Haliotis discus hannai and the diets which is easy to be ingested and digested, as well as contains much nutrient content, should be used. If the artificial diet is used, it should contain low concentration of flesh-eating content.